Declare visibility on class constants

lib/SimpleSAML/Auth/ProcessingChain.php

lib/SimpleSAML/Auth/State.php

lib/SimpleSAML/Error/CannotSetCookie.php

lib/SimpleSAML/Kernel.php

lib/SimpleSAML/Locale/Localization.php

lib/SimpleSAML/Logger.php

lib/SimpleSAML/Metadata/MetaDataStorageHandlerSerialize.php

lib/SimpleSAML/Session.php

lib/SimpleSAML/Utils/Random.php

lib/SimpleSAML/Utils/System.php

modules/admin/lib/Controller/Config.php

modules/core/lib/Auth/UserPassBase.php

modules/core/lib/Auth/UserPassOrgBase.php

modules/exampleauth/lib/Auth/Source/External.php

modules/multiauth/lib/Auth/Source/MultiAuth.php

modules/saml/lib/IdP/SQLNameID.php

tests/SigningTestCase.php

tests/lib/SimpleSAML/Utils/CryptoTest.php

tests/lib/SimpleSAML/Utils/SystemTest.php

tests/lib/SimpleSAML/Utils/XMLTest.php